CN102566198A - Device and method for amplifying terahertz (THz) wave optical parameters - Google Patents
Device and method for amplifying terahertz (THz) wave optical parameters Download PDFInfo
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- CN102566198A CN102566198A CN2012100599413A CN201210059941A CN102566198A CN 102566198 A CN102566198 A CN 102566198A CN 2012100599413 A CN2012100599413 A CN 2012100599413A CN 201210059941 A CN201210059941 A CN 201210059941A CN 102566198 A CN102566198 A CN 102566198A
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Abstract
The invention discloses a device for amplifying terahertz (THz) wave optical parameters. The device comprises a pumping source, a THz wave signal source and a THz wave parametric amplifier, wherein the THz wave parameter amplifier comprises a space beam collimating and splitting device and a nonlinear optical crystal, which are sequentially arranged according to a light path; a signal light input port and a pumping light input port are formed in the space beam collimating and splitting device; a THz wave output port is formed in the nonlinear optical crystal; pumping light which is emitted by the pumping source is emitted into the pumping light input port; the THz wave which is emitted by the THz wave signal source is emitted into the signal light input port; the output synthesis light of the space beam collimating and splitting device is emitted to the nonlinear optical crystal; and the THz wave is output through the nonlinear optical crystal. By adoption of the device, the problems of low output power, complicated structure of equipment and high cost of the conventional optical THz source technology are solved. The device has the advantages of high single-pass gain, low amplification noise and high power increase capacity and can be cascaded, and the power raising potential is increasingly enhanced.
Description
Technical field
The invention belongs to THz wave optical parameter amplifying technique, be specifically related to a kind of THz wave optical parameter amplification method and device thereof.
Background technology
Terahertz (THz) radiation is commonly referred to as the electromagnetic wave of frequency between 0.1THz～10THz, and its wave band is between microwave and far infrared.The THz electromagnetic radiation has very unique character; It can see through various biosomes, dielectric substance and gaseous substance; These media have abundant absorption and chromatic dispersion character at the THz wave band, and the THz signal of analytic sample just can obtain about the material composition in the material and physics, chemistry and biological information through measuring also.The Terahertz frequency domain has important use at aspects such as high data rate communication, secret communication, precise guidance and hiding weapon detections.Therefore, Terahertz (THz) technology has many-sided application prospect in fields such as national security, national economy and scientific researches.The research of THz radiation source is the important step of THz scientific technological advance and application.How to produce high power (high-energy), high efficiency THz radiation source becomes research of THz technical applications and development key problem.At present, the direct output power of THz radiation source is all in milliwatt (average power) and kilowatt (peak power), and optics THz wave parameter amplifying technique is the important channel that solves this key issue at present.
Optics THz wave parameter amplifying technique is based on optical difference frequency process (ω
THz=ω
Pump light-ω
Flashlight), can obtain higher THz ripple output power, and have the advantage of the big and compact conformation in the broadband of at room temperature turning round, gain.
Summary of the invention
The present invention aims to provide a kind of THz wave optical parameter amplification method and device thereof, and output power is low in the existing optics Terahertz source technology, device structure is complicated, the cost problem of higher to solve.
Technical solution of the present invention:
The THz wave optical parametric amplifier, its special character is: comprise pumping source, THz ripple signal source and THz wave parameter amplifier,
Said THz wave parameter amplifier comprises spatial beam collimation and beam splitting arrangement and the nonlinear optical crystal that sets gradually according to light path; Said spatial beam collimation and beam splitting arrangement are provided with the input port of flashlight input port and pump light; Said nonlinear optical crystal is provided with the output port of THz ripple; The pump light of said pumping source emission is incident to the input port of pump light; The THz ripple of said THz ripple signal source emission is incident to the flashlight input port, and the synthetic light of the output of said spatial beam collimation and beam splitting arrangement is incident to nonlinear optical crystal, said nonlinear optical crystal output THz ripple.
Also comprise feedback system; Second rotation platform that said feedback system comprises THz wave power meter, feedback circuit, THz wave reflection mirror and is arranged on THz wave reflection mirror bottom; Said THz wave reflection mirror is arranged on the light path of nonlinear optical crystal and with the THz ripple of nonlinear optical crystal output and becomes 45 ° of angles
Said THz wave parameter amplifier also comprises first rotation platform and the electric control module that is arranged on the nonlinear optical crystal bottom,
The THz ripple of said nonlinear optical crystal output is through the sample detecting input end of THz wave reflection mirror with THz wave reflection to THz wave power meter; Said feedback circuit output terminal is connected with THz wave power meter; The output terminal of said feedback circuit is connected with the input end of electric control module, and the output terminal of said electric control module is connected with first rotation platform.
Above-mentioned THz wave parameter amplifier also comprises THz ripple window, and said THz ripple window is arranged between nonlinear optical crystal and the THz wave reflection mirror.
Above-mentioned pumping source comprises the laser instrument, total reflective mirror, half-wave plate, Polarization Controller and the optical alignment that set gradually according to the light path beam system that contracts; Said total reflective mirror becomes 45 ° of angles with the laser instrument emitted light beams, the contract output pump light of beam system of said optical alignment inputs to the input port of pump light.
Above-mentioned nonlinear optical crystal is GaP crystal, ZGP crystal, GaSe crystal, GaAs crystal or DAST crystal.
Above-mentioned spatial beam collimation and beam splitting arrangement are off-axis parabolic mirror.
The parameter amplification method of THz wave optical parametric amplifier, its special character is: may further comprise the steps:
1] the pumping source flashlight of exporting pump light and the THz signal source output horizontal polarization of vertical polarization sends to THz wave parameter amplifier with the mode of conllinear: the flashlight of THz ripple signal source 16 outputs is identical with the pulse width of the pump light that pump light is exported;
Said THz wave parameter amplifier comprises spatial beam collimation and beam splitting arrangement and the nonlinear optical crystal that sets gradually according to light path; Spatial beam collimation and beam splitting arrangement are provided with the input port of flashlight input port and pump light; Nonlinear optical crystal is provided with the output port of THz ripple; The pump light of pumping source emission is incident to the input port of pump light: the flashlight of THz ripple signal source emission is incident to the flashlight input port, and pump light and flashlight close the synthetic light of bundle formation through spatial beam collimation and beam splitting arrangement shaping;
2] the synthetic light of spatial beam collimation and beam splitting arrangement output is incident to nonlinear optical crystal, and synthetic light produces the second nonlinear effect, THz ripple and ideler frequency light that output power is amplified.
Also comprise step 3] the feedback regulation step:
THz wave power meter carries out power calculation through the THz ripple of the collection reflection of THz wave reflection mirror; Result of calculation is sent to feedback circuit; Feedback circuit transmits control signal to the circuit control module according to result of calculation, and control signal is controlled the rotation of the first rotation platform rotation adjusting nonlinear optical crystal.
The production method of above-mentioned pump light is:
The laser instrument emission of lasering beam contracts beam system to spatial beam collimation and beam splitting arrangement input pumping light through total reflective mirror, half-wave plate, Polarization Controller and optical alignment, and the attenuator that uses half-wave plate and Polarization Controller to form is controlled and selected suitable pump light pulse energy and control output pump light is vertical polarization;
Said laser instrument is a single longitudinal mode, live width 0.003cm
-1, wavelength 1064nm, pulsewidth 8ns, single pulse energy is greater than 150mJ.
The present invention has the following advantages:
1, single-pass of the present invention gain high, amplify noise low, can cascade, constantly increase and have high power ascension potentiality, fill up the blank of domestic and international THz wave power optics amplifying technique;
2, multiplying arrangement of the present invention, property simple and reliable for structure is good;
3, multiplying arrangement of the present invention itself adopts power self check and feedback system, and power amplification is stable.
Description of drawings
Fig. 1 is principle framework figure of the present invention;
Fig. 2 is the structural representation of the embodiment of the invention;
Fig. 3 is that the amplification THz wavelength of the embodiment of the invention concerns synoptic diagram with generation ideler frequency optical wavelength;
Fig. 4 is that the amplification efficient of THz ripple of the embodiment of the invention is with the normalization synoptic diagram of THz wavelength change;
Wherein Reference numeral is: 1-laser instrument, 2-total reflective mirror, 3-half-wave plate, 4-Polarization Controller, the 5-optical alignment beam system that contracts; 6-THz ripple signal source, 7-off-axis parabolic mirror, 8-gallium phosphide crystal (GaP), 9-first rotation platform, 10-computer; 11-THz wave reflection mirror, 12-second rotation platform, 13-off-axis parabolic mirror, 14-THz power meter; The 15-pumping source, 16-THz ripple signal source, 17-terahertz light parameter amplifier TPA, 18-THz wave power meter.
Embodiment
The THz wave optical parametric amplifier; Comprise pumping source 15, THz ripple signal source 16 and THz wave parameter amplifier 17; THz wave parameter amplifier comprises spatial beam collimation and beam splitting arrangement and the nonlinear optical crystal that sets gradually according to light path; Spatial beam collimation and beam splitting arrangement are provided with the input port of flashlight input port and pump light; Nonlinear optical crystal is provided with the output port of THz ripple, and the pump light of pumping source emission is incident to the input port of pump light, and the THz ripple of THz ripple signal source emission is incident to the flashlight input port; The synthetic light of the output of spatial beam collimation and beam splitting arrangement is incident to nonlinear optical crystal, nonlinear optical crystal output THz ripple.Also comprise feedback system; Second rotation platform 12 that said feedback system comprises THz wave power meter 18, feedback circuit, THz wave reflection mirror 11 and is arranged on THz wave reflection mirror bottom; THz wave reflection mirror 11 is arranged on the light path of nonlinear optical crystal and with the THz ripple of nonlinear optical crystal output and becomes 45 ° of angles; THz wave parameter amplifier also comprises first rotation platform 9 and the electric control module that is arranged on the nonlinear optical crystal bottom
The THz ripple of nonlinear optical crystal output is through the sample detecting input end of THz wave reflection mirror with THz wave reflection to THz wave power meter; The feedback circuit output terminal is connected with THz wave power meter; The output terminal of feedback circuit is connected with the input end of electric control module, and the output terminal of electric control module is connected with first rotation platform.
THz wave parameter amplifier also comprises THz ripple window, and said THz ripple window is arranged between nonlinear optical crystal and the THz wave reflection mirror.
Pumping source comprises the laser instrument 1, total reflective mirror 2, half-wave plate 3, Polarization Controller 4 and the optical alignment that set gradually according to the light path beam system 5 that contracts; Said total reflective mirror becomes 45 ° of angles with the laser instrument emitted light beams, the contract output pump light of beam system of said optical alignment inputs to the input port of pump light.
Nonlinear optical crystal is GaP crystal, ZGP crystal, GaSe crystal, GaAs crystal or DAST crystal.Spatial beam collimation and beam splitting arrangement are off-axis parabolic mirror 7.
THz wave optical parameter amplification method comprises following performing step:
(1) pumping source is exported the pump light process THz wave parameter amplifier of vertical polarization; THz wave parameter amplifier receives direct pump light from pumping source, with THz ripple generation second nonlinear process of input in (2), amplifies the THz wave power and produces ideler frequency light; , the polarization direction of pump light and flashlight respectively with nonlinear optical crystal (crystallographic axis is the optical axis of crystal) the parallel or quadrature of direction.
(2) flashlight of THz signal source output horizontal polarization is through inject the THz wave parameter amplifier of pump light; The said THz glistening light of waves is learned parameter amplifier and is received the flashlight from the THz signal source, produces the second nonlinear effect with the pump light of having imported in (1), and the THz ripple that output power is amplified also produces ideler frequency light;
Consider Stability Control to the amplification process of optical parameter amplifier; This method also comprises step (3): the power of sampling THz wave parameter amplifier output, the anglec of rotation of nonlinear crystal makes amplifier have stable amplification efficient in the feedback adjustment amplifier in real time.
Step (1) is to adopt the attenuator of being made up of half-wave plate and polaroid to control to select suitable pump light pulse energy and control that to export pump light be vertical polarization.
Step (2) THz signal source is horizontal polarization output, need carry out Beam Control with THz ripple off axis paraboloidal mirror through before the amplifier.
The crystal that adopts in the amplifier in step (1) and (2) is gallium phosphide crystal 8 (GaP), crystal, wherein the polarization direction of pump light and flashlight respectively with the parallel and quadrature of crystal 001 direction.
In to THz ripple output power sampled measurements, can choose 14 pairs of output powers of 5% power input THz power meter with the THz beam splitter and measure.
The THz wave optical parametric amplifier comprises pumping source, THz ripple signal source and is arranged at the THz wave parameter amplifier with pump light, the same light path of flashlight; Wherein THz wave parameter amplifier has terahertz emission input and output port; THz wave parameter amplifier also is provided with the input port of corresponding pump light.
Consider and to measure output THz wave power; The sample detecting input end of said THz wave power measuring system and THz wave parameter amplifier terahertz emission output port constitute THz beam space coupling (such as can be through being coupled to input end from output terminal with two off axis paraboloidal mirrors), and the feedback signal output terminal of THz wavelength detection system is connected with the electric control module of THz twt amplifier.
Pumping source is nanosecond or picosecond pulse pump source.
The corresponding THz signal that amplifies of amplifier is nanosecond or picosecond pulse THz signal.
Pumping source and signal source need synchronously during for picosecond.
THz wave parameter amplifier comprises spatial beam collimation and beam splitting arrangement, gallium phosphide crystal GaP and THz ripple window, and THz ripple window is the PVC wave filter.
As the technique known notion, the process of optical difference frequency promptly: pump light-flashlight=ideler frequency light is a pump photon with energy duplicate to the remaining simultaneously energy of signal photon as ideler frequency photon radiation come out.The flashlight here is exactly the THz wave of our input.
The present invention is based on the THz ripple amplification system of transfer process under the parameter; As shown in Figure 1; This THz ripple produces the pumping source 15 pumping THz wave parameter amplifiers 17 of system; THz wave parameter amplifier 17 amplifies the flashlight of THz ripple signal source 16, and THz wave parameter amplifier 17 output powers are measured and FEEDBACK CONTROL THz wave parameter amplifier 17 by THz power meter 18, reaches the purpose of the THz power of control output.
Wherein pumping source 15 adopts ns level or ps level pumping source, transfers Q Nd:YAG laser instrument like Seeded PR II 8010 type macro-energy single longitudinal modes.The THz pulse of THz ripple signal source 16 outputs must be identical with the pulse width of pump light.Control pumping source 15 is imported THz wave parameter amplifier 17 with the light beam of THz ripple signal source 16 outputs with the mode of conllinear, comprises 8 and 9, the position (changing the coupling angle of crystal) of high-accuracy rotation platform 9 control crystal 8.The THz wave power is measured and feedback system 18 comprises 10,12-14.
The present invention be the single longitudinal mode that seed injects is transferred Q the Nd:YAG laser instrument as pump light source, the leading indicator of this laser instrument is: single longitudinal mode (live width 0.003cm
-1), wavelength 1064nm, pulsewidth 8ns, single pulse energy is greater than 150mJ.The attenuator that uses half-wave plate and polaroid to form is controlled and selected suitable pump light pulse energy and control output pump light is vertical polarization.
Employing GaP crystal low to the THz absorption coefficient and that have a high optical nonlinearity coefficient is built terahertz light parameter amplifier (TPA).The basic mechanical design feature of this TPA is: amplify THz pulsewidth 5ns, the amplifier gain bandwidth is 0.5-2.5THz, utilizes off-axis parabolic mirror control THz glistening light of waves bundle, after converging, incides in the nonlinear crystal; Control high-accuracy rotation platform and change coupling angle, the THz ripple that utilizes off axis paraboloidal mirror collimation output power to amplify simultaneously.When input THz ripple flashlight peak power was number W, enlargement factor was about 100.Choose reasonable pump power and crystal length are to increase the THz output power and to realize that gain saturation improves the output stability of THz ripple.Choose a part of THz ripple incident THz power meter feedback to the computer 10, the rotation by computer control crystal obtains stable amplification.
Claims (9)
1. THz wave optical parametric amplifier is characterized in that: comprise pumping source, THz ripple signal source and THz wave parameter amplifier,
Said THz wave parameter amplifier comprises spatial beam collimation and beam splitting arrangement and the nonlinear optical crystal that sets gradually according to light path; Said spatial beam collimation and beam splitting arrangement are provided with the input port of flashlight input port and pump light; Said nonlinear optical crystal is provided with the output port of THz ripple; The pump light of said pumping source emission is incident to the input port of pump light; The THz ripple of said THz ripple signal source emission is incident to the flashlight input port, and the synthetic light of the output of said spatial beam collimation and beam splitting arrangement is incident to nonlinear optical crystal, said nonlinear optical crystal output THz ripple.
2. THz wave optical parametric amplifier according to claim 1; It is characterized in that: also comprise feedback system; Second rotation platform that said feedback system comprises THz wave power meter, feedback circuit, THz wave reflection mirror and is arranged on THz wave reflection mirror bottom; Said THz wave reflection mirror is arranged on the light path of nonlinear optical crystal and with the THz ripple of nonlinear optical crystal output and becomes 45 ° of angles
Said THz wave parameter amplifier also comprises first rotation platform and the electric control module that is arranged on the nonlinear optical crystal bottom,
The THz ripple of said nonlinear optical crystal output is through the sample detecting input end of THz wave reflection mirror with THz wave reflection to THz wave power meter; Said feedback circuit output terminal is connected with THz wave power meter; The output terminal of said feedback circuit is connected with the input end of electric control module, and the output terminal of said electric control module is connected with first rotation platform.
3. THz wave optical parametric amplifier according to claim 2 is characterized in that: said THz wave parameter amplifier also comprises THz ripple window, and said THz ripple window is arranged between nonlinear optical crystal and the THz wave reflection mirror.
4. according to claim 1 or 2 or 3 described THz wave optical parametric amplifiers; It is characterized in that: said pumping source comprises the laser instrument, total reflective mirror, half-wave plate, Polarization Controller and the optical alignment that set gradually according to the light path beam system that contracts; Said total reflective mirror becomes 45 ° of angles with the laser instrument emitted light beams, the contract output pump light of beam system of said optical alignment inputs to the input port of pump light.
5. THz wave optical parametric amplifier according to claim 4 is characterized in that: said nonlinear optical crystal is GaP crystal, ZGP crystal, GaSe crystal, GaAs crystal or DAST crystal.
6. THz wave optical parametric amplifier according to claim 5 is characterized in that: said spatial beam collimation and beam splitting arrangement are off-axis parabolic mirror.
7. according to the parameter amplification method of the said THz wave optical parametric amplifier of claim 1, it is characterized in that: may further comprise the steps:
1] the pumping source flashlight of exporting pump light and the THz signal source output horizontal polarization of vertical polarization sends to THz wave parameter amplifier with the mode of conllinear: the flashlight of THz ripple signal source output is identical with the pulse width of the pump light that pump light is exported;
Said THz wave parameter amplifier comprises spatial beam collimation and beam splitting arrangement and the nonlinear optical crystal that sets gradually according to light path; Spatial beam collimation and beam splitting arrangement are provided with the input port of flashlight input port and pump light; Nonlinear optical crystal is provided with the output port of THz ripple; The pump light of pumping source emission is incident to the input port of pump light: the flashlight of THz ripple signal source emission is incident to the flashlight input port, and pump light and flashlight close the synthetic light of bundle formation through spatial beam collimation and beam splitting arrangement shaping;
2] the synthetic light of spatial beam collimation and beam splitting arrangement output is incident to nonlinear optical crystal, and synthetic light produces the second nonlinear effect, THz ripple and ideler frequency light that output power is amplified.
8. parameter amplification method according to claim 7 is characterized in that: also comprise step 3] the feedback regulation step:
THz wave power meter carries out power calculation through the THz ripple of the collection reflection of THz wave reflection mirror; Result of calculation is sent to feedback circuit; Feedback circuit transmits control signal to the circuit control module according to result of calculation, and control signal is controlled the rotation of the first rotation platform rotation adjusting nonlinear optical crystal.
9. according to claim 7 or 8 described parameter amplification methods, it is characterized in that: the production method of said pump light is:
The laser instrument emission of lasering beam contracts beam system to spatial beam collimation and beam splitting arrangement input pumping light through total reflective mirror, half-wave plate, Polarization Controller and optical alignment, and the attenuator that uses half-wave plate and Polarization Controller to form is controlled and selected suitable pump light pulse energy and control output pump light is vertical polarization;
Said laser instrument is a single longitudinal mode, live width 0.003cm
-1, wavelength 1064nm, pulsewidth 8ns, single pulse energy is greater than 150mJ.
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| CN103292899A (en) * | 2012-12-12 | 2013-09-11 | 天津大学 | High-sensitivity high-resolution-ratio terahertz radiation detector capable of working at room temperature |
| CN103323401A (en) * | 2013-06-07 | 2013-09-25 | 中国科学院西安光学精密机械研究所 | Terahertz wave real-time imaging method and device based on optical parameter up-conversion |
| CN104503183A (en) * | 2014-12-10 | 2015-04-08 | 天津大学 | Self-frequency-conversion terahertz parametric oscillator |
| CN104701634A (en) * | 2015-02-05 | 2015-06-10 | 北京理工大学 | Terahertz quasi-optical power combining and amplifying device |
| CN111740297A (en) * | 2020-07-08 | 2020-10-02 | 浙江富春江环保科技研究有限公司 | Double-beam laser system with laser energy monitoring and feedback and control method thereof |
| CN112414564A (en) * | 2020-11-19 | 2021-02-26 | 中国工程物理研究院激光聚变研究中心 | Terahertz frequency measuring device and method |
| CN117977381A (en) * | 2024-03-29 | 2024-05-03 | 中国科学技术大学 | Mid-infrared laser source |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103292899A (en) * | 2012-12-12 | 2013-09-11 | 天津大学 | High-sensitivity high-resolution-ratio terahertz radiation detector capable of working at room temperature |
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| CN103323401B (en) * | 2013-06-07 | 2015-10-21 | 中国科学院西安光学精密机械研究所 | Based on the THz wave real time imagery method that optical parameter is changed and device |
| CN104503183A (en) * | 2014-12-10 | 2015-04-08 | 天津大学 | Self-frequency-conversion terahertz parametric oscillator |
| CN104503183B (en) * | 2014-12-10 | 2018-04-03 | 天津大学 | Self frequency-changing's tera-hertz parametric oscillator |
| CN104701634A (en) * | 2015-02-05 | 2015-06-10 | 北京理工大学 | Terahertz quasi-optical power combining and amplifying device |
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| CN111740297A (en) * | 2020-07-08 | 2020-10-02 | 浙江富春江环保科技研究有限公司 | Double-beam laser system with laser energy monitoring and feedback and control method thereof |
| CN112414564A (en) * | 2020-11-19 | 2021-02-26 | 中国工程物理研究院激光聚变研究中心 | Terahertz frequency measuring device and method |
| CN112414564B (en) * | 2020-11-19 | 2022-03-22 | 中国工程物理研究院激光聚变研究中心 | Terahertz frequency measuring device and method |
| CN117977381A (en) * | 2024-03-29 | 2024-05-03 | 中国科学技术大学 | Mid-infrared laser source |
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